Peculiarities of the effect of octyl- and nonylphenols on the growth and development of microalgae
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The influence of hormonelike xenobiotics (HLXs), i.e., octyland nonylphenols, on microalgae has been investigated. Studies have shown that the effect of HLXs on the life and activity of the hydrobionts under consideration depends on their chemical structure, concentration, and algae taxonomic group. Nonylphenols (NPs) have shown greater toxicity than that of octylphenols (OPs) for all algae studied: the concentrations of NPs (EC 50) that induce 50% inhibition of the growth of microalgae are 1.5–3.3 times lower than EC 50 for OP (depending on the culture). It has been established that blue-green algae are more sensitive to alkylphenols, while green algae are less sensitive to them. The 20–30% stimulation of the growth of cyanobacteria of genus Microcystis was revealed in the presence of low NP and OP concentrations. Under stress conditions induced by alkylphenols, changes in the formation of photosynthetic pigments are observed and the stimulation of the synthesis of algotoxins and odorants (geosmin and 2-methylisoborneol) is possible.
Keywordsnonylphenols octylphenol cyanobacteria green algae photosynthetic pigments microcystins odorants
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